"The Bean Machine, also known as the quincunx or Galton box, is a device invented by Sir Francis Galton[1] to demonstrate the central limit theorem, in particular that the normal distribution is approximate to the binomial distribution." - http://en.wikipedia.org/wiki/Bean_machine
I don't understand, they take a distribution known to look like a normal distribution, then... yep it looks like a normal distribution, central limit theorem proved.
